CH.63 of the manga is a body swap.
For those who know the series the BS is with Suzu and Ayane and they end up reverting back to normal at the end of the end of the chapter.
Chapter does not happen in the anime.
Heres the anime`s op for people who want to know more about the series:
http://uk.youtube.com/watch?v=uC4HLo4ZJkI